docs: def deserialize(cls, assoc_s):
          """
          Parse an association as stored by serialize().
  
          inverse of serialize
  
  
          @param assoc_s: Association as serialized by serialize()
  
          @type assoc_s: str
  
  
          @return: instance of this class
          """
          pairs = kvform.kvToSeq(assoc_s, strict=True)
          keys = []
          values = []
          for k, v in pairs:
              keys.append(k)
              values.append(v)
  
          if keys != cls.assoc_keys:
              raise ValueError('Unexpected key values: %r', keys)
  
          version, handle, secret, issued, lifetime, assoc_type = values
          if version != '2':
              raise ValueError('Unknown version: %r' % version)
          issued = int(issued)
          lifetime = int(lifetime)
          secret = oidutil.fromBase64(secret)
          return cls(handle, secret, issued, lifetime, assoc_type)